Category: Python

Django scripting: “AppRegistryNotReady: Apps aren’t loaded yet” solution!

If you want to make a simple script that wants to import your application built on top of the Django framework, you would probably do this code:

import django
from app.models import MyModel

You will probably get this error:

django.core.exceptions.AppRegistryNotReady: Apps aren't loaded yet


Don’t panic!
The solution is to run your application’s setup() before imports, as follows:

import django

if __name__ == '__main__':
    # import AFTER setup
    from app.models import MyModel
    # from now I can access MyModel!!

Python: compile and run multiple versions without collisions

You have to go find the source code for the Python version that you want.

Example, run an “old” Python 3.6, go here and take the one that we want.

Then get the source code and compile it:

mkdir ~/source ; cd ~/source
tar xvf Python-3.6.13.tar.xz
cd ~/source/Python-3.6.13
./configure && make
sudo make altinstall

“Et voilà”!

~/source/Python-3.6.13$ python3.6
Python 3.6.13 (default, May 21 2021, 17:12:12) 
[GCC 9.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.